title: Synthesis of wurtzite Cu2ZnGeSe4 nanocrystals and their thermoelectric properties.
abstract: An unusual wurtzite phase of Cu2ZnGeSe4 (CZGSe) has been discovered and its corresponding nanocrystals (NCs) were synthesized by using a facile hot-injection solution-phase synthesis method. Moreover, the formation mechanism of this new phase of CZGSe, instead of the typically observed stannite structure, has been investigated in detail, which indicates that wurtzite CZGSe, which represents the kinetic phase, could be prepared by using a kinetic growth process without phase transformation into the thermodynamically stable stannite structure during the colloidal synthesis. In addition, the potential of wurtzite CZGSe as a thermoelectric material is demonstrated by characterizing the thermoelectric properties of as-synthesized wurtzite CZGSe NCs. This work allows for a rational manipulation of the NCs with a desired crystal structure through adjusting the thermodynamics and kinetics without using any additives and, because of its simplicity and versatility, it may be extended to the phase-controlled synthesis of other chalcogenide NCs.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190 (P. R. China).
authors.forename: Ding-Jiang
authors.initials: DJ
authors.lastname: Xue
authors.forename: Fei
authors.initials: F
authors.lastname: Jiao
authors.forename: Hui-Juan
authors.initials: HJ
authors.lastname: Yan
authors.forename: Wei
authors.initials: W
authors.lastname: Xu
authors.forename: Daoben
authors.initials: D
authors.lastname: Zhu
authors.forename: Yu-Guo
authors.initials: YG
authors.lastname: Guo
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Wan
keywords: chalcogens; germanium; nanocrystals; semiconductors; wurtzite